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Yingran Liang,Yuanyuan Zhang,Miaomiao Liu,Xue Han,Jianping Zhang,Xuan Zhang,Li Chu 대한약학회 2020 Archives of Pharmacal Research Vol.43 No.8
Many studies describe the stimulating eff ect ofquercetin on Ca 2+ channels and the treatment of cardiovasculardiseases such as myocardial ischemia and hypertension. However, these studies are scattered and contradictory. The aim of this study is to elucidate the protective eff ects ofquercetin against isoproterenol (ISO)-induced myocardialischemia and verify the cellular mechanisms based on theL-type Ca 2+ channel (LTCC), Ca 2+ transients, and myocardialcontractility. An animal model of myocardial ischemiawas established by subcutaneous injection of ISO for 2 days. Quercetin significantly reduced J-point elevation, heartrate, reactive oxygen species, serum levels of myocardialenzymes, superoxide dismutase, catalase, glutathione, glutathioneperoxidase, glutathione S-transferase and improvedheart pathologic morphology. L-type Ca 2+ current (I Ca-L )was tested in an experiment with isolated rat myocardialcells by using the whole-cell patch-clamp recording techniqueand IonOptix Myocam detection system. Quercetin reduced I Ca-L in a concentration-dependent fashion with ahalf-maximal inhibitory concentration of 4.67 × 10 –4 M. Quercetin also shifted the current–voltage curve upwards,moved the activation and inactivation curves to the left andinhibited the amplitude of the cell shortening and Ca 2+ transients. The results showed that quercetin acts as a LTCCinhibitor and exerts a cardioprotective eff ect by inhibitingCa 2+ infl ux and contractility in rats.
Rational design of porous NiCo2S4 nanotubes for hybrid supercapacitor
Wang Haiyang,Liang Miaomiao,He Zemin,Guo Zhun,Zhao Yang,Li Kexuan,Song Wenqi,Zhang Yongming,Zhang Xin,Zhao Yuzhen,Miao Zongcheng 한국물리학회 2022 Current Applied Physics Vol.35 No.-
The nanotube-consisted flower-like NiCo2S4 is successfully fabricated by a novel two-step hydrothermal technique. X-ray diffraction (XRD) identifies the spinel structure, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) imply the flower-like morphology of the synthesized NiCo2S4. The electrochemical behaviors are studied by cyclic voltammetry and galvanostatic charge-discharge measurements. The NiCo2S4 nanotubes demonstrate enhanced pseudocapacitive performance of 429.5 C g− 1 at current density of 0.5 A g− 1 . The NiCo2S4//AC device delivers high energy density of 37.69 Wh kg− 1 , maximum power density of 4000.6 W kg− 1 and satisfied cycle property of 96% capacitance retention after over 7000 cycles. The results show that the NiCo2S4 nanotubes are promising electrode material for high performance supercapacitor applications.
Qiang Chen,Miaomiao Gao,Liang Tao,Yurong Nan 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.9
In this paper, an adaptive fixed time parameter estimation and synchronization control scheme is proposedfor multiple robotic manipulators with unknown parameters and lumped disturbances. A mean coupling synchronization error is defined by averaging all the tracking errors of multiple robotic manipulators, and an adaptive fixed time synchronization control scheme is proposed to guarantee that both the tracking error and the synchronization error can simultaneously converge to zero within a fixed time, which means that the upper bound of the settling time is independent of the initial conditions. Moreover, an adaptive parameter estimation law is developed through constructing auxiliary filtered variables to achieve the accurate estimation of the unknown system parameters. Comparative simulations are provided to validate the effectiveness of the proposed scheme.